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1/5 the number of nX8 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
0

%I #6 Mar 31 2012 12:36:03

%S 181,3701360,26231137608,247462638659680,2112817100467905536

%N 1/5 the number of nX8 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

%C Column 8 of A185825

%e Some solutions for 4X8 with a(1,1)=0

%e ..0..0..0..0..2..2..2..2....0..0..0..0..4..4..3..3....0..0..0..0..3..3..2..2

%e ..0..1..1..0..0..3..3..1....0..1..1..0..0..1..3..3....0..1..1..0..0..3..3..3

%e ..0..0..0..1..1..0..0..1....0..0..0..1..1..1..4..4....0..0..0..1..1..2..2..2

%e ..1..1..0..0..0..0..1..1....1..1..0..0..0..0..0..4....1..1..0..0..0..0..0..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 05 2011